class PrometheusCore:
    def nodes(self):
        pass

    def task_sets(self):
        pass

    def alerts(self):
        pass

class Nodes:
    def nodes_memory(self):
        NodesMemory()

class NodeMemory:
    def __init__(self):
        pass

    def total(self):
        pass

    def allocable(self):
        pass

    def allocated(self):
        pass

    def used(self):
        pass

class NodesMemory:
    def __init__(self):
        pass

    def query(self):
        pass

    def query_range(self):
        pass